Error: wasmtime._error.WasmtimeError: unknown import: env::invoke_viii has not been defined

[paulocoutinhox]

Hi,

Can anyone help me here:
https://github.com/paulocoutinhox/pdfium-lib/pull/140/files

When i call my lib pdfium.std.wasm i get the error:

python3 make.py test-wasmtime                                                                               
Testing with wasmtime...
Traceback (most recent call last):
  File "/Users/paulo/Developer/workspaces/cpp/pdfium-lib/make.py", line 250, in <module>
    main(args)
  File "/Users/paulo/Developer/workspaces/cpp/pdfium-lib/make.py", line 217, in main
    wasm.run_task_test_wasmtime()
  File "/Users/paulo/Developer/workspaces/cpp/pdfium-lib/modules/wasm.py", line 567, in run_task_test_wasmtime
    instance = linker.instantiate(store, module)
  File "/opt/homebrew/lib/python3.10/site-packages/wasmtime/_linker.py", line 171, in instantiate
    raise WasmtimeError._from_ptr(error)
wasmtime._error.WasmtimeError: unknown import: `env::invoke_viii` has not been defined

Python code:

def run_task_test_wasmtime():
    import wasmtime
    from wasmtime import Engine, Func, Instance, Linker, Module, Store
    from wasmtime.loader import WasiConfig

    l.colored("Testing with wasmtime...", l.YELLOW)

    current_dir = f.current_dir()

    for target in c.targets_wasm:
        # paths
        relative_dir = os.path.join(
            "build",
            target["target_os"],
            target["target_cpu"],
        )

        root_dir = os.path.join(current_dir, relative_dir)
        gen_dir = os.path.join(root_dir, "gen")
        gen_out_dir = os.path.join(gen_dir, "out")
        wasm_file = os.path.join(gen_out_dir, "pdfium.std.wasm")

        # create the engine and store
        engine = Engine()
        store = Store(engine)

        # load the WebAssembly module
        module = Module.from_file(engine, wasm_file)

        # create a linker to provide the necessary imports
        linker = Linker(engine)

        # WASI support using wasmtime.loader.WasiConfig
        wasi_config = WasiConfig()
        wasi_config.inherit_stdin()
        wasi_config.inherit_stdout()
        wasi_config.inherit_stderr()
        store.set_wasi(wasi_config)

        # instantiate the WebAssembly module with linker
        instance = linker.instantiate(store, module)

        # now we can invoke exported functions from the WebAssembly module
        try:
            init_library = instance.exports(store)["FPDF_InitLibrary"]
            init_library(store)
            l.i("FPDF_InitLibrary successfully called.")
        except KeyError:
            l.e("Function 'FPDF_InitLibrary' not found.")

        # invoke 'FPDF_GetLastError'
        try:
            get_last_error = instance.exports(store)["FPDF_GetLastError"]
            result = get_last_error(store)
            l.i(f"Result from FPDF_GetLastError: {result}")
        except KeyError:
            l.e("Function 'FPDF_GetLastError' not found.")

        l.i(f"Result: {result}")

    l.ok()

Thanks.

[xdoardo]

Thanks for the post! It seems you're using emscripten. Wasmtime does not support it currently, while wasmer does at least in part. Interesting endeavour, nonetheless. I think it should be possible to compile it using WASIX, let us know if you need any help!